package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

/**
 * @author hyj
 * @create 2023--11--06
 */

public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (token == null){
            return true;
        }

        //2.基于token从redis中获取用户
        String key = LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);


        //3.判断用户是否存在
        if (userMap.isEmpty()){
           return true;
        }

        //将Hash Map转换为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);//false是出现错误的时候报错

        //5.存储,存入到ThreadLocal中
        UserHolder.saveUser(userDTO);

        //更新token的有效期
        stringRedisTemplate.expire(key,LOGIN_USER_TTL, TimeUnit.MINUTES);

        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //释放用户
        UserHolder.removeUser();
    }
}
